Just over four months into his deployment, Hoover watched from a gun turret as the truck in front of him hit a roadside bomb. The explosion killed four of his friends and a local interpreter. The names of those who died are engraved in a Memorial Bracelet he wears.
"There's shock ... the enemy just killed your men. There's a lot of anger," Hoover said. "You try to keep it out of your head ... but obviously there's not a day when I don't think about it."